<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script src="../js/jquery-1.11.3.js"></script>
    <script>


        $(function(){
            var s = $('ul').find('span').css('color','red');//
            console.log(s);
        })



    </script>
</head>
<body>
<ul>
    <div>
        <p>aaa</p>
    </div>
    <li>
        <p>aa<span>a</span></p>
    </li>
</ul>
<ul>
    <p>
        asdasd
    </p>
</ul>

<h2>aaa</h2>
</body>
</html>